/Engine/Source/Editor/UnrealEd/Public/FbxImporter.h
Fill FBX skeletons to OutSortedLinks
void BuildSkeletonSystem ( [TArray](API\Runtime\Core\Containers\TArray)< FbxCluster * > & ClusterArray, [TArray](API\Runtime\Core\Containers\TArray)< FbxNode * > & OutSortedLinks )